/* Hyperdimensional Atlas — "Obsidian Observatory" styling.
   Dark, calm, instrument-like. Geometric sans for headings, monospace for data. */

:root {
  --bg: #030507;
  --bg-2: #07100f;
  --panel: rgba(7, 11, 14, 0.72);
  --panel-border: rgba(154, 189, 181, 0.18);
  --ink: #eaf2ff;
  --ink-dim: #a7b7c9;
  --ink-faint: #738398;
  --cyan: #51f0e5;
  --blue: #6f9cff;
  --violet: #b88cff;
  --amber: #f5bd63;
  --mint: #86f0b8;
  --rose: #ff7a98;

  --sans: "Inter", "Segoe UI", system-ui, -apple-system, "Helvetica Neue", Arial, sans-serif;
  --mono: "JetBrains Mono", ui-monospace, "SF Mono", "Cascadia Code", Consolas, monospace;

  --sp-1: 6px; --sp-2: 12px; --sp-3: 18px; --sp-4: 28px; --sp-5: 44px; --sp-6: 72px;
  --radius: 8px;
  --maxw: 1180px;
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: 88px;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* Subtle procedural grain + vignette over the whole page. */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 1;
  background:
    linear-gradient(135deg, rgba(81, 240, 229, 0.08), transparent 34%),
    linear-gradient(315deg, rgba(245, 189, 99, 0.055), transparent 38%),
    linear-gradient(180deg, rgba(184, 140, 255, 0.04), transparent 58%);
}
body::after {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 2;
  opacity: 0.035;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

.mono { font-family: var(--mono); }

a { color: var(--cyan); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ---------- Top navigation ---------- */
.topnav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 30;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-3);
  padding: 14px clamp(18px, 3vw, 38px);
  background: linear-gradient(180deg, rgba(3, 5, 7, 0.82), rgba(3, 5, 7, 0.48));
  border-bottom: 1px solid rgba(154, 189, 181, 0.10);
  backdrop-filter: blur(14px);
}
.brand { display: flex; flex-direction: column; line-height: 1.2; }
.brand-title {
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  font-size: 0.86rem;
}
.brand-sub { color: var(--ink-faint); font-size: 0.72rem; letter-spacing: 0.06em; }
.nav-links { display: flex; align-items: center; gap: var(--sp-1); }
.nav-btn {
  background: rgba(255,255,255,0.025);
  border: 1px solid rgba(154, 189, 181, 0.08);
  color: var(--ink-dim);
  font-family: var(--sans);
  font-size: 0.82rem;
  letter-spacing: 0.04em;
  padding: 7px 13px;
  border-radius: 8px;
  cursor: pointer;
  transition: color 0.2s, border-color 0.2s, background 0.2s;
}
.nav-btn:hover { color: var(--ink); border-color: rgba(81, 240, 229, 0.28); background: rgba(81,240,229,0.07); }
.nav-icon { color: var(--ink-faint); display: inline-flex; padding: 6px; }
.nav-icon:hover { color: var(--cyan); }

/* ---------- Stage ---------- */
.stage {
  position: relative;
  width: 100%;
  height: 100vh;
  height: 100dvh;
  overflow: hidden;
  background:
    linear-gradient(90deg, rgba(3,5,7,0.88), rgba(3,5,7,0.36) 45%, rgba(3,5,7,0.72)),
    #030507;
}
.stage::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  opacity: 0.24;
  background-image:
    linear-gradient(rgba(154, 189, 181, 0.12) 1px, transparent 1px),
    linear-gradient(90deg, rgba(154, 189, 181, 0.10) 1px, transparent 1px),
    linear-gradient(120deg, transparent 0 48%, rgba(245, 189, 99, 0.11) 49%, transparent 51%);
  background-size: 64px 64px, 64px 64px, 360px 360px;
  mask-image: linear-gradient(90deg, black, transparent 72%);
}
#scene { position: absolute; inset: 0; z-index: 0; width: 100%; height: 100%; display: block; }
.ambient-field {
  position: absolute;
  inset: 0;
  z-index: 3;
  width: 100%;
  height: 100%;
  display: block;
  opacity: 0.82;
  pointer-events: none;
  mix-blend-mode: screen;
}

.stage-intro {
  position: absolute;
  z-index: 12;
  top: clamp(118px, 16vh, 152px);
  left: clamp(340px, 23vw, 430px);
  width: min(470px, calc(100vw - 820px));
  min-width: 360px;
  color: var(--ink);
  text-shadow: 0 1px 20px rgba(3,5,7,0.72);
  pointer-events: auto;
}
.stage-intro::before {
  content: "";
  position: absolute;
  inset: -26px -34px -30px -28px;
  z-index: -1;
  pointer-events: none;
  background: linear-gradient(90deg, rgba(3,5,7,0.86), rgba(3,5,7,0.56) 58%, transparent);
  border-left: 1px solid rgba(134,240,184,0.18);
  filter: blur(0);
}
.stage-kicker {
  display: block;
  margin-bottom: var(--sp-2);
  color: var(--mint);
  font-size: 0.7rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
}
.stage-intro h1 {
  margin: 0 0 var(--sp-3);
  max-width: 10ch;
  font-size: clamp(2.8rem, 4.6vw, 4.55rem);
  line-height: 0.94;
  font-weight: 720;
  letter-spacing: 0;
}
.stage-intro p {
  margin: 0;
  max-width: 46ch;
  color: var(--ink-dim);
  font-size: 0.98rem;
  line-height: 1.65;
}
.stage-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: var(--sp-3);
}
.stage-action {
  appearance: none;
  border: 1px solid rgba(154, 189, 181, 0.20);
  border-radius: 8px;
  padding: 10px 14px;
  font: 600 0.78rem/1 var(--sans);
  color: var(--ink);
  cursor: pointer;
  transition: transform 0.2s ease, border-color 0.2s ease, background 0.2s ease;
}
.stage-action:hover {
  transform: translateY(-1px);
  border-color: rgba(81, 240, 229, 0.36);
}
.stage-action.primary {
  background: rgba(81, 240, 229, 0.14);
}
.stage-action.ghost {
  background: rgba(255,255,255,0.04);
  color: var(--ink-dim);
}
.stage-metrics {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 8px;
  margin: var(--sp-3) 0 0;
}
.stage-metrics div {
  min-width: 0;
  padding: 9px 10px;
  border: 1px solid rgba(154, 189, 181, 0.14);
  border-radius: 8px;
  background: rgba(7, 11, 14, 0.48);
  backdrop-filter: blur(10px);
}
.stage-metrics dt {
  margin: 0;
  color: var(--ink-faint);
  font-family: var(--mono);
  font-size: 0.62rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}
.stage-metrics dd {
  margin: 2px 0 0;
  color: var(--mint);
  font-family: var(--mono);
  font-size: 0.78rem;
  white-space: nowrap;
}

/* ---------- Panels ---------- */
.panel {
  position: absolute;
  top: 104px;
  z-index: 20;
  width: 286px;
  max-height: calc(100vh - 232px);
  max-height: calc(100dvh - 232px);
  overflow-y: auto;
  padding: var(--sp-3);
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: var(--radius);
  box-shadow: 0 18px 60px rgba(0,0,0,0.34);
  backdrop-filter: blur(16px);
  transition: transform 0.35s ease, opacity 0.35s ease;
  scrollbar-width: thin;
  scrollbar-color: rgba(120,150,200,0.3) transparent;
}
.panel::-webkit-scrollbar { width: 8px; }
.panel::-webkit-scrollbar-thumb { background: rgba(120,150,200,0.25); border-radius: 8px; }
.panel-left { left: clamp(18px, 2.5vw, 34px); }
.panel-right { right: clamp(18px, 2.5vw, 34px); width: 300px; }

.panel-head { margin-bottom: var(--sp-3); }
.panel-eyebrow {
  display: block;
  font-family: var(--mono);
  font-size: 0.66rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--mint);
  margin-bottom: 2px;
}
.panel-head h2 { margin: 0; font-size: 1.04rem; font-weight: 600; letter-spacing: 0.02em; }

/* Control groups */
.control-group {
  padding: var(--sp-2) 0;
  border-top: 1px solid rgba(120,150,200,0.10);
}
.control-group:first-of-type { border-top: none; }
.control-label {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.78rem;
  color: var(--ink-dim);
  letter-spacing: 0.03em;
  margin-bottom: var(--sp-1);
}
.control-label.sub { margin-top: var(--sp-2); font-size: 0.72rem; color: var(--ink-faint); }
.control-label output { color: var(--cyan); }
.control-note {
  margin: 8px 0 0;
  color: var(--ink-faint);
  font-size: 0.72rem;
  line-height: 1.45;
}

input[type="range"] {
  width: 100%;
  -webkit-appearance: none;
  appearance: none;
  height: 3px;
  background: rgba(120,150,200,0.25);
  border-radius: 3px;
  outline: none;
  margin: 4px 0 2px;
}
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 14px; height: 14px; border-radius: 50%;
  background: var(--mint);
  cursor: pointer;
  box-shadow: 0 0 8px rgba(134,240,184,0.55);
}
input[type="range"]::-moz-range-thumb {
  width: 14px; height: 14px; border: none; border-radius: 50%;
  background: var(--mint); cursor: pointer;
}

.seg { display: flex; gap: 4px; background: rgba(255,255,255,0.03); padding: 3px; border-radius: 8px; }
.seg-btn {
  flex: 1;
  background: transparent;
  border: none;
  color: var(--ink-dim);
  font-family: var(--mono);
  font-size: 0.68rem;
  padding: 6px 4px;
  border-radius: 6px;
  cursor: pointer;
  transition: background 0.2s, color 0.2s;
}
.seg-btn:hover { color: var(--ink); }
.seg-btn.active { background: rgba(81,240,229,0.14); color: var(--cyan); }

.select {
  width: 100%;
  background: rgba(255,255,255,0.04);
  color: var(--ink);
  border: 1px solid var(--panel-border);
  border-radius: 8px;
  padding: 7px 9px;
  font-family: var(--mono);
  font-size: 0.74rem;
  cursor: pointer;
}
.select:disabled { opacity: 0.4; cursor: not-allowed; }

.check {
  display: flex;
  align-items: center;
  gap: 9px;
  font-size: 0.8rem;
  color: var(--ink-dim);
  padding: 5px 0;
  cursor: pointer;
}
.check input { accent-color: var(--mint); width: 15px; height: 15px; }

.btn {
  margin-top: var(--sp-2);
  width: 100%;
  background: rgba(81,240,229,0.10);
  border: 1px solid rgba(81,240,229,0.26);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 0.8rem;
  padding: 9px;
  border-radius: 8px;
  cursor: pointer;
  transition: background 0.2s;
}
.btn:hover { background: rgba(81,240,229,0.18); }

/* Inspector */
.insp-name { margin: 4px 0 2px; font-size: 1.5rem; font-weight: 600; letter-spacing: 0.01em; }
.insp-sub { font-size: 0.74rem; color: var(--ink-faint); }
.insp-sub .dot { margin: 0 6px; }
.insp-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: var(--sp-2);
  margin: var(--sp-3) 0;
}
.insp-grid div {
  min-width: 0;
  background: rgba(255,255,255,0.03);
  border: 1px solid rgba(120,150,200,0.1);
  border-radius: 8px;
  padding: 9px 11px;
}
.insp-grid dt { font-size: 0.66rem; color: var(--ink-faint); letter-spacing: 0.06em; text-transform: uppercase; margin: 0; }
.insp-grid dd {
  margin: 3px 0 0;
  font-size: clamp(0.78rem, 1.1vw, 1.04rem);
  line-height: 1.28;
  color: var(--cyan);
  overflow-wrap: anywhere;
}
.insp-block { border-top: 1px solid rgba(120,150,200,0.1); padding-top: var(--sp-2); margin-top: var(--sp-2); }
.insp-block h3 { margin: 0 0 4px; font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.12em; color: var(--ink-faint); }
.insp-text { margin: 0; font-size: 0.84rem; color: var(--ink-dim); line-height: 1.55; }
.insp-warn { margin: 8px 0 0; font-size: 0.78rem; color: var(--amber); }

/* Performance readout */
.perf {
  position: absolute;
  left: clamp(18px, 2.5vw, 34px);
  bottom: var(--sp-3);
  z-index: 15;
  display: flex;
  gap: var(--sp-3);
  font-size: 0.68rem;
  color: var(--ink-faint);
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: 8px;
  padding: 7px 12px;
  backdrop-filter: blur(8px);
}
.perf i { font-style: normal; letter-spacing: 0.1em; }
.perf b { color: var(--mint); font-weight: 500; margin-left: 4px; }

/* Dimensional ladder */
.ladder-wrap {
  position: absolute;
  left: 50%;
  bottom: var(--sp-3);
  transform: translateX(-50%);
  z-index: 15;
  width: min(720px, calc(100% - 720px));
  min-width: min(calc(100% - 32px), 300px);
  text-align: center;
}
.ladder-caption {
  margin: 0 0 8px;
  font-size: 0.78rem;
  color: var(--ink-dim);
  min-height: 1.2em;
}
.ladder {
  display: flex;
  gap: 4px;
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: 10px;
  padding: 6px;
  backdrop-filter: blur(10px);
  overflow-x: auto;
  scrollbar-width: none;
}
.ladder::-webkit-scrollbar { display: none; }
.ladder-step {
  flex: 1 0 auto;
  min-width: 58px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  background: transparent;
  border: 1px solid transparent;
  border-radius: 8px;
  padding: 7px 4px;
  color: var(--ink-faint);
  cursor: pointer;
  transition: background 0.2s, color 0.2s, border-color 0.2s;
}
.ladder-step:hover { color: var(--ink); background: rgba(255,255,255,0.03); }
.ladder-step.active { color: var(--mint); border-color: rgba(134,240,184,0.34); background: rgba(134,240,184,0.08); }
.ladder-icon svg { width: 22px; height: 22px; display: block; }
.ladder-num { font-size: 0.66rem; }
.ladder-name { font-size: 0.6rem; letter-spacing: 0.02em; }

/* Mobile FABs (hidden on desktop) */
.fab {
  display: none;
  position: absolute;
  bottom: 80px;
  z-index: 25;
  background: var(--panel);
  border: 1px solid var(--panel-border);
  color: var(--ink);
  font-family: var(--mono);
  font-size: 0.72rem;
  padding: 9px 13px;
  border-radius: 20px;
  backdrop-filter: blur(8px);
  cursor: pointer;
}
.fab-left { left: var(--sp-3); }
.fab-right { right: var(--sp-3); }

/* WebGL fallback */
.fallback {
  position: absolute;
  inset: 0;
  z-index: 40;
  overflow: hidden;
  display: block;
  background:
    linear-gradient(90deg, rgba(3,5,7,0.96), rgba(3,5,7,0.68) 45%, rgba(3,5,7,0.88)),
    linear-gradient(140deg, rgba(81,240,229,0.12), transparent 42%),
    linear-gradient(320deg, rgba(245,189,99,0.08), transparent 44%),
    #030507;
}
.fallback[hidden] {
  display: none !important;
}
.fallback::before {
  content: "";
  position: absolute;
  inset: 0;
  opacity: 0.26;
  background-image:
    linear-gradient(rgba(154,189,181,0.11) 1px, transparent 1px),
    linear-gradient(90deg, rgba(154,189,181,0.10) 1px, transparent 1px),
    linear-gradient(120deg, transparent 0 48%, rgba(245,189,99,0.10) 49%, transparent 51%);
  background-size: 58px 58px, 58px 58px, 320px 320px;
  mask-image: linear-gradient(90deg, transparent, black 18%, black 80%, transparent);
}
.fallback-svg {
  position: absolute;
  inset: 4% 2% auto auto;
  width: min(66vw, 860px);
  height: min(76vh, 660px);
  display: block;
  opacity: 0.26;
  filter: drop-shadow(0 0 24px rgba(81,240,229,0.24));
}
.fallback-canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
  pointer-events: none;
}
.fallback-grid {
  position: relative;
  z-index: 2;
  width: min(1180px, calc(100% - 80px));
  min-height: 100%;
  margin: 0 auto;
  padding: 118px 0 76px;
  display: grid;
  grid-template-columns: minmax(0, 520px) minmax(260px, 340px);
  justify-content: space-between;
  gap: clamp(28px, 5vw, 72px);
  align-items: center;
}
.fallback-copy {
  max-width: 520px;
  text-shadow: 0 1px 18px rgba(5,6,10,0.82);
}
.fallback-kicker {
  display: block;
  margin-bottom: var(--sp-2);
  color: var(--mint);
  font-size: 0.72rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
}
.fallback-copy h1 {
  margin: 0 0 var(--sp-3);
  max-width: 10ch;
  font-size: clamp(3rem, 6vw, 5.1rem);
  line-height: 0.94;
  font-weight: 740;
  letter-spacing: 0;
}
.fallback-copy p {
  margin: 0;
  max-width: 55ch;
  color: var(--ink-dim);
  font-size: clamp(1rem, 1.7vw, 1.14rem);
}
.fallback-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-2);
  margin-top: var(--sp-4);
}
.fallback-actions .btn {
  width: auto;
  min-width: 150px;
  margin-top: 0;
  padding: 10px 14px;
}
.fallback-primary {
  background: rgba(81,240,229,0.14);
  border-color: rgba(81,240,229,0.34);
}
.fallback-secondary {
  background: rgba(255,255,255,0.04);
  border-color: rgba(120,150,200,0.20);
  color: var(--ink-dim);
}
.fallback-inspector {
  padding: var(--sp-3);
  background: rgba(7, 11, 14, 0.74);
  border: 1px solid rgba(154,189,181,0.20);
  border-radius: var(--radius);
  box-shadow: 0 18px 70px rgba(0,0,0,0.36);
  backdrop-filter: blur(16px);
  transform: translateY(18px);
}
.fallback-inspector h2 {
  margin: 2px 0 var(--sp-3);
  font-size: 1.55rem;
  line-height: 1.1;
}
.fallback-stat-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--sp-2);
  margin: 0 0 var(--sp-3);
}
.fallback-stat-grid div {
  padding: 10px 11px;
  border: 1px solid rgba(154,189,181,0.12);
  border-radius: 8px;
  background: rgba(255,255,255,0.035);
}
.fallback-stat-grid dt {
  margin: 0;
  color: var(--ink-faint);
  font-family: var(--mono);
  font-size: 0.64rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.fallback-stat-grid dd {
  margin: 2px 0 0;
  color: var(--mint);
  font-family: var(--mono);
  font-size: 1rem;
}
.fallback-details {
  border-top: 1px solid rgba(154,189,181,0.12);
  padding-top: var(--sp-2);
}
.fallback-details summary {
  cursor: pointer;
  color: var(--ink-faint);
  font-size: 0.78rem;
}
.fallback-diagnostic {
  margin: var(--sp-2) 0 0;
  max-height: 110px;
  overflow: auto;
  white-space: pre-wrap;
  font-size: 0.66rem;
  color: var(--ink-faint);
}
.no-webgl .stage-intro, .no-webgl .panel, .no-webgl .ladder-wrap, .no-webgl .perf, .no-webgl .fab { display: none; }

/* ---------- Narrative & document sections ---------- */
.narrative { position: relative; z-index: 5; background: var(--bg); }
.narrative-section {
  padding: var(--sp-6) var(--sp-4);
  border-top: 1px solid rgba(120,150,200,0.08);
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s ease, transform 0.7s ease;
  scroll-margin-top: 88px;
}
.narrative-section.visible { opacity: 1; transform: none; }
.narrative-inner, .doc-inner { max-width: var(--maxw); margin: 0 auto; }
.doc-inner.narrow { max-width: 820px; }
.narrative-inner { max-width: 960px; }

.kicker {
  display: block;
  font-size: 0.7rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--cyan);
  margin-bottom: var(--sp-2);
}
.narrative-section h2, .doc-section h2 {
  font-size: clamp(1.5rem, 3.2vw, 2.3rem);
  font-weight: 600;
  letter-spacing: -0.01em;
  margin: 0 0 var(--sp-3);
  line-height: 1.15;
}
.narrative-section p, .doc-section p { color: var(--ink-dim); max-width: 70ch; }
.narrative-section em, .doc-section em { color: var(--ink); font-style: italic; }
.caption { font-size: 0.82rem; color: var(--ink-faint); }
.equation {
  font-family: var(--mono);
  font-size: 1rem;
  color: var(--cyan);
  background: rgba(70,224,240,0.06);
  border-left: 2px solid rgba(70,224,240,0.4);
  padding: 10px 14px;
  border-radius: 0 8px 8px 0;
  max-width: max-content;
}

/* Mini diagrams */
.mini { margin: var(--sp-3) 0; }
.mini-canvas {
  width: 100%;
  height: clamp(260px, 32vw, 340px);
  display: block;
  background: radial-gradient(80% 80% at 50% 45%, rgba(20,26,42,0.6), rgba(6,8,14,0.2));
  border: 1px solid rgba(120,150,200,0.12);
  border-radius: var(--radius);
}

/* Doc sections (Mathematics, Physics, About) */
.doc-section { padding: var(--sp-6) var(--sp-4); position: relative; z-index: 5; background: var(--bg); border-top: 1px solid rgba(120,150,200,0.08); scroll-margin-top: 88px; }
.doc-section.alt { background: var(--bg-2); }
.lede { font-size: 1.05rem; color: var(--ink); }

.formula-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--sp-2);
  margin: var(--sp-4) 0;
}
.formula-card {
  background: rgba(255,255,255,0.03);
  border: 1px solid rgba(120,150,200,0.12);
  border-radius: 8px;
  padding: var(--sp-2) var(--sp-3);
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.formula-name { font-size: 0.68rem; text-transform: uppercase; letter-spacing: 0.1em; color: var(--ink-faint); }
.formula-eq { font-family: var(--mono); font-size: 1.05rem; color: var(--cyan); }

.table-pair {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.4fr);
  gap: var(--sp-4);
  margin: var(--sp-4) 0;
}
.table-block h3 { font-size: 0.95rem; margin: 0 0 4px; }
.table-block {
  min-width: 0;
  max-width: 100%;
  overflow-x: auto;
}
.table-note { font-size: 0.78rem; color: var(--ink-faint); margin: 0 0 var(--sp-2); }
.data-table { width: 100%; border-collapse: collapse; font-size: 0.82rem; }
.data-table th {
  text-align: left;
  font-family: var(--mono);
  font-size: 0.66rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--ink-faint);
  padding: 6px 10px;
  border-bottom: 1px solid rgba(120,150,200,0.2);
}
.data-table td { padding: 6px 10px; border-bottom: 1px solid rgba(120,150,200,0.07); color: var(--ink-dim); }
.data-table td.mono { color: var(--ink); }
.doc-more { font-size: 0.84rem; }

.phys-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: var(--sp-3);
  margin: var(--sp-4) 0;
}
.phys-card {
  background: rgba(255,255,255,0.025);
  border: 1px solid rgba(120,150,200,0.12);
  border-radius: var(--radius);
  padding: var(--sp-3);
}
.phys-card h3 { margin: 0 0 8px; font-size: 0.98rem; color: var(--ink); }
.phys-card p { margin: 0; font-size: 0.86rem; }
.humility {
  margin-top: var(--sp-4);
  border-left: 2px solid var(--amber);
  padding: var(--sp-2) var(--sp-3);
  background: rgba(255,180,84,0.05);
  border-radius: 0 8px 8px 0;
}
.humility h3 { margin: 0 0 6px; font-size: 0.9rem; color: var(--amber); }
.footer-note { margin-top: var(--sp-4); color: var(--ink-faint); font-size: 0.72rem; letter-spacing: 0.06em; }

/* ---------- Site footer (authorship & citation) ---------- */
.site-footer {
  position: relative;
  z-index: 5;
  background: var(--bg-2);
  border-top: 1px solid rgba(120, 150, 200, 0.12);
  padding: var(--sp-6) var(--sp-4) var(--sp-4);
}
.footer-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.6fr);
  gap: var(--sp-5);
}
.footer-author,
.footer-cite,
.footer-inner > * {
  min-width: 0;
}
.footer-eyebrow {
  display: block;
  font-size: 0.66rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--cyan);
  margin-bottom: var(--sp-2);
}
.footer-name { margin: 0; font-size: 1.25rem; font-weight: 600; }
.footer-role { margin: 4px 0 var(--sp-2); color: var(--ink-dim); font-size: 0.86rem; }
.footer-links { font-size: 0.8rem; color: var(--ink-faint); }
.footer-links .sep { margin: 0 8px; color: var(--ink-faint); }
.footer-cite .cite-text { margin: 0 0 var(--sp-2); color: var(--ink-dim); font-size: 0.86rem; }
.footer-links,
.cite-text {
  overflow-wrap: anywhere;
}
.cite-bibtex {
  margin: 0;
  padding: var(--sp-3);
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(120, 150, 200, 0.12);
  border-radius: 8px;
  font-size: 0.72rem;
  line-height: 1.5;
  color: var(--ink-dim);
  white-space: pre;
  overflow-x: auto;
}
.footer-base {
  max-width: var(--maxw);
  margin: var(--sp-5) auto 0;
  padding-top: var(--sp-3);
  border-top: 1px solid rgba(120, 150, 200, 0.08);
  color: var(--ink-faint);
  font-size: 0.7rem;
  letter-spacing: 0.05em;
}
@media (max-width: 760px) {
  .footer-inner { grid-template-columns: 1fr; gap: var(--sp-4); }
}

/* ---------- Panels hidden (H key) ---------- */
.panels-hidden .panel { opacity: 0; pointer-events: none; transform: translateY(-8px); }
.panels-hidden .ladder-wrap, .panels-hidden .perf { opacity: 0; pointer-events: none; }

/* ---------- Responsive ---------- */
@media (max-width: 1380px) {
  .stage-intro { display: none; }
  .ladder-wrap {
    width: min(620px, calc(100% - 690px));
  }
}

@media (max-width: 980px) {
  .table-pair { grid-template-columns: 1fr; }
  .ladder-wrap {
    width: min(520px, calc(100% - 650px));
    min-width: min(calc(100% - 32px), 240px);
  }
  .fallback-grid {
    width: calc(100% - 48px);
    grid-template-columns: minmax(0, 1fr);
    align-content: center;
    gap: var(--sp-4);
  }
  .fallback-copy {
    max-width: 620px;
  }
  .fallback-copy h1 {
    max-width: 12ch;
    font-size: clamp(2.7rem, 8vw, 4.4rem);
  }
  .fallback-inspector {
    max-width: 520px;
    transform: none;
  }
}

@media (max-width: 760px) {
  .topnav { padding: var(--sp-2) var(--sp-3); }
  .brand-sub { display: none; }
  .nav-links { margin-left: auto; }
  .nav-btn { display: none; }
  .fallback-grid {
    width: calc(100% - 32px);
    padding: 88px 0 36px;
    grid-template-columns: 1fr;
    gap: var(--sp-4);
    align-content: start;
  }
  .fallback-svg {
    inset: 8% -14% auto auto;
    width: 118%;
    height: 50vh;
    transform: none;
    opacity: 0.20;
  }
  .fallback-canvas {
    opacity: 0.42;
  }
  .fallback-copy h1 {
    max-width: 100%;
    font-size: clamp(2.2rem, 10vw, 3.2rem);
    line-height: 0.98;
  }
  .fallback-copy p {
    font-size: 0.95rem;
  }
  .fallback-actions .btn {
    flex: 1 1 145px;
    min-width: 0;
  }
  .fallback-inspector {
    padding: var(--sp-2);
  }
  .narrative-section,
  .doc-section,
  .site-footer {
    padding-left: var(--sp-3);
    padding-right: var(--sp-3);
  }
  .data-table {
    min-width: 430px;
  }
  .panel {
    top: auto;
    bottom: 0;
    width: 86%;
    max-width: 340px;
    max-height: 62vh;
    border-radius: var(--radius) var(--radius) 0 0;
  }
  .panel-left { left: 0; transform: translateX(-105%); }
  .panel-right { right: 0; transform: translateX(105%); }
  body.show-left .panel-left { transform: translateX(0); }
  body.show-right .panel-right { transform: translateX(0); }
  .fab { display: block; }
  .fab { bottom: 194px; }
  .perf {
    left: 50%;
    bottom: 142px;
    transform: translateX(-50%);
    font-size: 0.6rem;
    gap: var(--sp-2);
    padding: 6px 9px;
    white-space: nowrap;
  }
  .ladder-wrap { width: calc(100% - 20px); }
  .ladder-name { display: none; }
  .ladder-step { min-width: 44px; }
}

/* ---------- Reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; animation: none !important; }
  .narrative-section { opacity: 1; transform: none; }
}